﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;

namespace HelloCore2
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRouting();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            //app.UseRouter(builder=> builder.MapGet("action",async context => await context.Response.WriteAsync("this is action") ));

            RequestDelegate hander = context => context.Response.WriteAsync("this is a action");
            var route = new Route(
                new RouteHandler(hander),
                "action",
                app.ApplicationServices.GetRequiredService<IInlineConstraintResolver>()
                );

            app.UseRouter(route);


            app.Use(async(context,next) => {
                await context.Response.WriteAsync("1. buforeStart..."); 
                await next.Invoke();
            });

            app.Use(next => {
                return (context)=>{
                    context.Response.WriteAsync("2. in the middle of start...");
                    return next(context);
                };
            });

            app.Map("/task", taskApp =>
            {
                taskApp.Run(async context =>
                {
                    await context.Response.WriteAsync("this is a task");
                });
            });

            app.Run(async (context) =>
            {
                await context.Response.WriteAsync( "3. start .....");
            });
        }
    }
}
